Laser Safety 101: What Every New Operator Needs to Know

A laser engraver is a safe machine to run every day when it is set up properly and the operator knows the rules. The same beam that engraves a plaque can start a fire or damage an eye if those rules are ignored. Here is what a new operator should know before the first job.

Laser classes, in plain terms

Lasers are classified under IEC 60825-1, the international standard that Canada also uses. The class tells you how much hazard reaches the operator in normal use.

• Class 1: no hazard in normal use.
• Class 2: low-power visible light. The blink reflex protects the eye from a brief exposure.
• Class 4: the highest class. The beam can injure eyes and skin from direct or reflected light, and it can start fires.

The laser source inside any engraver is Class 4. What changes the rating is the enclosure. Epilog’s enclosed systems are rated Class 2: the cabinet and interlocks contain the cutting beam during normal operation. Kern’s enclosed LaserCELL and Studio are Class 2 as well. Open-bed systems, such as large-format flatbeds and marking heads built into a production line, are Class 4. They need guarding, controlled access and wavelength-rated eyewear.

Don’t defeat the interlocks. On an enclosed machine the lid interlock is what keeps a Class 4 beam inside the cabinet. Never tape, bridge or bypass it, even “just for a quick check”.

Eye protection

On an enclosed Class 2 system with all covers in place, you don’t need laser eyewear for normal operation.

You do need it when:

• Service work requires the beam path open while the laser can fire. The glasses must match the wavelength: CO₂ (about 10,600 nm) and fiber (about 1,064 nm) need different eyewear. One pair does not cover both.
• You run an open-bed or Class 4 system. Everyone in the controlled area wears rated eyewear.

Keep the right glasses on site even if you rarely need them. Never look into the beam path, even through tinted glasses, unless they are rated for that wavelength and power.

Fume extraction

A laser vaporizes material. The smoke, called the plume, carries fine particles and gases. What’s in it depends on what you are processing.

Every laser needs its fumes removed. You have two options:

1. Duct to outdoors with a blower sized to the machine.
2. Filter and recirculate with a fume extractor. This is the usual answer when you can’t vent outside, when you run mixed materials, or when the laser sits in an office, classroom or retail space.

FiltraBox units are made in Canada and filter in stages: a pre-filter, a HEPA filter for fine particles and activated carbon to adsorb gases and odours. Carbon fills up over time, so change filters on the schedule for the materials you run.

Some examples of what’s in the fumes:

• Acrylic gives off methyl methacrylate, an irritant.
• Wood smoke is fine particulate that you don’t want to breathe.
• Rubber releases sulphur compounds and a strong smell.
• PVC releases hydrogen chloride, which harms people and corrodes the machine. Never laser it.

Budget for fume extraction when you budget for the laser.

Fire safety

Most of what a CO₂ laser does is vaporize material, but a small flame at the cut is normal on wood, paper, cardboard and some fabrics. The risk is that flame growing when no one is watching.

• Never leave the laser running unattended. Read and follow the manufacturer’s fire procedure.
• Keep a CO₂ fire extinguisher mounted near the machine, and make sure everyone knows where it is.
• Keep the bed and tray clean. Built-up char and offcuts catch fire.
• Use air assist when cutting, and don’t push power and speed past what the material needs.
• Know what you’re cutting. If you can’t confirm what a material is, don’t put it in the laser.

Materials you must never laser

• PVC and vinyl, including many “vinyl” sheets, faux leathers and Kydex-type sheet: hydrogen chloride gas.
• Polycarbonate (Lexan): burns, discolours and gives off harmful fumes.
• ABS: melts and gives off hydrogen cyanide.
• HDPE: melts and catches fire rather than cutting.
• PTFE (Teflon): releases fluorine compounds.
• Fibreglass and FR4 circuit board: glass dust and toxic resin fumes.
• Polystyrene and polypropylene foam: catch fire easily.
• Chrome-tanned leather: can release hexavalent chromium. Use laserable leatherette (PU-based) or leather sold as laser-safe.
• Beryllium copper: toxic dust.
• Carbon fibre: harmful dust and resin fumes.

When in doubt, read the material’s Safety Data Sheet (SDS). If it lists hazardous decomposition products, those products will be in your exhaust.

Training and compliance in Canada

Workplace laser safety falls under provincial occupational health and safety rules, such as WorkSafeBC’s OHS Regulation in British Columbia and the Occupational Health and Safety Act in Ontario. WHMIS and SDS rules apply to the materials and consumables you use. Many employers also follow ANSI Z136.1, the widely used laser-safety practice standard, especially for Class 4 work.

Good practice for any shop:

• Train every operator before they run the machine, and keep a record of it.
• Name one person as the laser safety officer, even informally, to own the rules and the training records.
• Post the rules beside the machine: material list, fire steps, emergency stop.

Training is included with every new laser. Your quote spells out the details. Safety is part of training: interlocks, materials, fire response and daily care. Contact us if you need extra sessions for new staff.

The short version

Most laser incidents come from four things: a bypassed interlock, an unattended job, the wrong material, or poor fume extraction. All four are preventable. If you have a safety question about a specific machine or material, ask us before you buy.